/Engine/Plugins/Experimental/ChaosVD/Source/ChaosVD/Public/ChaosVDPlaybackController.h
Locks the steps timeline of a given track so each time you move between frames, it will automatically scrub to the locked in step
void LockTrackInCurrentStep ( [EChaosVDTrackType](API\Plugins\ChaosVD\EChaosVDTrackType) TrackType, int32 TrackID )